Individual skill
web-performance
Make websites fast: Core Web Vitals, loading optimization, rendering performance, and measurement workflows. Use when pages are slow or targets must be met.
skills/web-performance/SKILL.md
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# Web Performance
A practical guide to web performance: Core Web Vitals, the loading pipeline (and what blocks it), rendering performance, image/font/JS optimization, and a measurement workflow that finds real bottlenecks instead of chasing scores.
## Overview
Performance = **how fast the page becomes usable**, measured by Core Web Vitals: **LCP** (largest contentful paint — main content visible, <2.5s), **INP** (interaction to next paint — responsiveness, <200ms), **CLS** (cumulative layout shift — visual stability, <0.1). Optimize in that priority order for most sites. Measure field data (CrUX/real users) over lab scores — lab lies about networks and devices.
## When to use
- Slow pages: diagnosing LCP/INP/CLS failures.
- Performance budgets for new projects.
- Image, font, and JavaScript optimization.
- Setting up real-user monitoring (RUM).